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MaxCharacter.js

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/*

Given a string of characters, return the character that appears the most often.

Example: input = "Hello World!" return "l"

*/

const maxCharacter = (value) => {

if (typeof value !== 'string') {

throw new TypeError('The param should be a string')

} else if (!value) {

throw new Error('The param should be a valid string')

}

const occurrences = {}

for (let i = 0; i < value.length; i++) {

const char = value[i]

if (/\s/.test(char)) continue

occurrences[char] = occurrences[char] + 1 || 1

}

let maxCharacter = null

let maxCount = 0

Object.keys(occurrences).forEach(char => {

if (occurrences[char] > maxCount) {

maxCount = occurrences[char]

maxCharacter = char

}

})

return maxCharacter

}

export { maxCharacter }